An electric filament bulb can be worked from____________?

Related Mcqs:

1. The hot resistance of the bulb’s filament is higher than its cold resistance because the temperature co-efficient of the filament is___________________?

   A. zero
   B. negative
   C. positive
   D. about 2 ohms per degree

2. The filament of an electric bulb is made of______________?

   A. carbon
   B. aluminium
   C. tungsten
   D. nickel

3. A 40 W bulb is connected in series with a room heater. If now 40 W bulb is replaced by 100 W bulb, the heater output will__________

   A. decrease
   B. increase
   C. remain same
   D. heater will burn out

4. A light bulb draws 300 mA when the voltage across it is 240 V. The resistance of the light bulb is___________?

   A. 400 Q
   B. 600 Q
   C. 800 Q
   D. 1000 Q

5. Three 60 W bulbs are in parallel across the 60 V power line. If one bulb burns open_________________?

   A. there will be heavy current in the main line
   B. rest of the two bulbs will not light
   C. all three bulbs will light
   D. the other two bulbs will light

6. Electric pressure is also called________?

   A. resistance
   B. power
   C. voltage
   D. energy

7. An instrument which detects electric current is known as_____________?

   A. voltmeter
   B. rheostat
   C. wattmeter
   D. galvanometer

8. In an electric kettle water boils in 10 m minutes. It is required to boil the boiler in 15 minutes, using same supply mains______________?

   A. length of heating element should be decreased
   B. length of heating element should be increased
   C. length of heating element has no effect on heating if water
   D. none of the above

9. When electric current passes through a metallic conductor, its temperature rises. This is due to__________?

   A. collisions between conduction electrons and atoms
   B. the release of conduction electrons from parent atoms
   C. mutual collisions between metal atoms
   D. mutual collisions between conducting electrons

10. When electric current passes through a bucket full of water, lot of bubbling is observeD. This suggests that the type of supply is____________?

    A. A. C.
    B. D. C.
    C. any of above two
    D. none of the above